When the Chargers are on defense vs. Jaguars

Jacksonville Jaguars tight end Allen Reisner celebrates after scoring on a touchdown pass from quarterback Blaine Gabbert during the first half of an NFL preseason football game against the New York Jets, Saturday, Aug. 17, 2013, in East Rutherford, N.J. (AP Photo/Seth Wenig)

/ AP

Jacksonville Jaguars tight end Allen Reisner celebrates after scoring on a touchdown pass from quarterback Blaine Gabbert during the first half of an NFL preseason football game against the New York Jets, Saturday, Aug. 17, 2013, in East Rutherford, N.J. (AP Photo/Seth Wenig)

Jacksonville Jaguars tight end Allen Reisner celebrates after scoring on a touchdown pass from quarterback Blaine Gabbert during the first half of an NFL preseason football game against the New York Jets, Saturday, Aug. 17, 2013, in East Rutherford, N.J. (AP Photo/Seth Wenig) (/ AP)

The Jaguars are scoring 11.7 points per game, last in the NFL. The huge problem remains below-average quarterback play. At full strength, the Jaguars would be intriguing, but injuries and a recent trade thinned the talent.

After facing five consecutive quarterbacks who can run away from defenders, the Chargers get an easier target in Chad Henne, a pocket passer whose 40 time was 4.92 in 2008.

Henne, filling in for an overwhelmed Blaine Gabbert, has four interceptions, two touchdown passes and a 58.4-percent completion rate. He has a big arm.

Chargers v. Jaguars - Oct. 20 at Jacksonville

The tackles were to be Eugene Monroe, a top-10 performer on Henne's blind side; and rookie Luke Joeckel, drafted second overall. Rookie GM David Caldwell dealt Monroe, who is in his walk year, three weeks ago for Baltimore's 2014 fourth- and fifth-round picks. The move allowed Joeckel to switch to left tackle, his natural position -- but he fractured his ankle in his first half there, against the Rams in Week Five.

The offense's best player is receiver Cecil Shorts III, who runs the route tree and breaks tackles. A shoulder injury suffered last Sunday has limited him this week.

The Rams didn't guard receiver Justin Blackmon on a slant, and he took it 67 yards for a gift touchdown. Blackmon is beating cornerbacks and catching Henne's lasers before other defenders can make a play. In his last two games, he has 19 catches for 326 yards and a TD. "He's aggressive," said cornerback Derek Cox, a teammate last year.

The Chargers defense, coming off its best performance, figures to gang up on Blackmon, who is nursing a hamstring injury, and force Henne to hit other targets. Tackling compact Maurice Jones-Drew (2.9 per carry) is also on the agenda for a unit that could be without Donald Butler (groin). "He can embarrass you," Jarret Johnson said. "It's like hitting a wall."

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